Abstract
As is clear from the previous chapters, DC commutator machines are ideal machines to obtain controlled torque and speed. To obtain similar properties, rotating field machines require more complicated supplies and control circuits. In this chapter we derive the basic control methods for rotating field machines, with as starting point the DC commutator machine characteristic properties.
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Notes
- 1.
For a brush axis in the neutral position, this requires a compensation winding or the absence of saturation-induced armature reaction; however, a brush axis which is not in the neutral position may result in armature reaction for non-rated operating conditions.
- 2.
In the absence of saturation.
- 3.
In fact, also note that fluxes cannot be added mathematically if there is any saturation.
- 4.
In the “L” circuit of Part1, we referred the total leakage to the rotor.
- 5.
Is it now safe to conclude that there is always field orientation in an induction machine?
- 6.
However, in most cases, the rotor leakage of a cage motor is heavily saturation-dependent.
- 7.
This is shown above for steady state.
- 8.
In the following equations in this section, all currents and fluxes are amplitude values (without the hat notation); see also Part 4.
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Melkebeek, J.A. (2018). Basics of Controlled Electrical Drives. In: Electrical Machines and Drives. Power Systems. Springer, Cham. https://doi.org/10.1007/978-3-319-72730-1_17
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DOI: https://doi.org/10.1007/978-3-319-72730-1_17
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